Extracorporeal blood treatment system and valve unit for pre/post infusion

An extracorporeal blood treatment system has a first holder (18), a second holder (19), an infusion pump (4) and an infusion valve unit (13). The first holder (18) is mounted on a housing (1a) of the system and configured to hold a blood treatment device (2). The second holder (19) is mounted on the housing (1a) and configured to hold an extracorporeal blood circuit (3) coupled to the blood treatment device (2). The infusion valve unit (13) has a first part (13b) and a second part (13a) releasable connectable to the first part (13b). The first part (13b) is mounted on the housing (1a), and has an inlet (25) coupled to the infusion pump (4). The second part (13a) has a first outlet (7a) and a second outlet (10a) that are connected to an infusion circuit configured to couple to the extracorporeal blood circuit (3). Further, the second part (13a) has a one-way valve configured to allow infusion liquid to flow from the inlet (25) towards at least one of the first and second outlets (7a, 10a), and to block fluid flow towards the inlet (25).